Superconductivity-Insensitive Order at q ∼1 /4 in Electron-Doped Cuprates
Abstract
One of the central questions in the cuprate research is the nature of the normal state that develops into high-temperature superconductivity (HTSC). In the normal state of hole-doped cuprates, the existence of a charge density wave (CDW) is expected to shed light on the mechanism of HTSC. With evidence emerging for CDW order in the electron-doped cuprates, the CDW is thought to be a universal phenomenon in high-Tc cuprates. However, the CDW phenomena in electron-doped cuprates are quite different than those in hole-doped cuprates. Here, we study the nature of the putative CDW in an electron-doped cuprate through direct comparisons between as-grown and postannealed Nd1.86Ce0.14CuO4 (NCCO) single crystals using Cu L3 -edge resonant soft x-ray scattering (RSXS) and angle-resolved photoemission spectroscopy (ARPES). The RSXS result reveals that the nonsuperconducting NCCO shows the same reflections at the wave vector (∼1 /4 , 0, l ) as the reported superconducting NCCO. This superconductivity-insensitive signal is quite different from the CDW reflection in hole-doped cuprates. Moreover, the ARPES result suggests that the fermiology cannot account for such wave vectors. These results call into question the universality of the CDW phenomenon in the cuprates.
- Publication:
-
Physical Review X
- Pub Date:
- December 2017
- DOI:
- 10.1103/PhysRevX.7.041066
- arXiv:
- arXiv:1712.01053
- Bibcode:
- 2017PhRvX...7d1066J
- Keywords:
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- Condensed Matter - Superconductivity;
- Condensed Matter - Materials Science;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 18 pages, 4 figures, 5 pages of Supplemental Material